"Small invertebrates" refers to tiny animals that do not have a backbone or spinal column.
Sentences with «small invertebrates»
These spiders are opportunistic hunters that prey on small invertebrates and vertebrates. (newscientist.com)
Each coral branch contains thousands of small invertebrates called polyps, and these tiny creatures thrive in warm, tropical waters. (seasidemexico.com)
Many more crinoids, crab, shrimp, brittle starfish, basket starfish and other small invertebrates hide among the coral. (ambergriscaye.com)